George



(No Model.) 7

G. PARKER, 7

AUTOMATIC STOP FOR STEAM ENGINES.

No. 337,611. Patented Mar. 9, 1886 'NITED STATES PATENT Price.

GEORGE PARKER, OF BAY CITY, MICHIGAN.

AUTOMATIC STOP FDR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 337,611, dated March 9,1886.

Application flied July 23, 1855.

To all whom it may concern.-

Be it known that I, GEORGEPARKER, of Bay City, in the county of Bay andState of Michigan, have invented new and useful Improvementsin AutomaticStops for Steam-Engines; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to theaccompanying drawing which forms a part of this specification.

This invention relates to a new and useful improvementin stop-motion forsteam-engines, of which the following is a specification, referencebeing bad to the accompanying drawing, wherein my improvement is shownin elevation.

My stop-motion is designed to come automatically into action if themotion of the engine should increase beyond the limit of its normalaction; and the object is to prevent the engine from running away andthereby occasioning loss by breakage and otherwise, as often happensthrough the failure of the gov ernor to act.

' My invention consistsin providing the throttle-valve of the enginewith a tripping device so arranged that a detent, which is controlled bycentrifugal force derived from the motion of the engine, willautomatically trip it if the engine increases its motion beyond itsnormal limit, all as hereinafter described.

A is the crank-shaft of the engine, and B is afianged disk, preferablymade in halves and bolted together, so as to be firmly secured to thecrank-shaft.

G is a flying weight adj ustably secured upon the arm D,which latter ispivotally secured at a to the disk.

E is a coil-spring secured atone end to the arm D, and at the other toalever, F. The lever F is pivotally secured at b to the disk, and isprovided at the rear end with an adjustingscrew, 0.

G is an upright secured in proximity to the flanged rim of the disk B.

H is a weighted bar loosely held in position by the guides d d, and isprovided with an ottset or shoulder, e, which, when engaged upon theedge of theguide d, prevents the weighted bar from dropping by itsweight through the 5g guides (1 cl.

Serial No.172,395. (No model.)

I is the throttle-valve of the engine. J is its actuating lock'lever,provided with a counter-weight, K,and an arm, L, for unlocking, all soarranged that by pulling on the free end of the arm L the lever J isunlocked, and, impelled by the gravity of the weight K, automaticallyturns off the steam.

M is a chain or rope connected at one end to the unlockingarm L of thethrottle-valve le' ver, and at the other to the upper end of the bar H,suitable sheaves being used to support the chain 011. The operatinglever of the steam-whistle N is also preferably connected to this chain.

In practice the parts are so arranged that when the speed of theengineincreases beyond its normal limit the centrifugal force of theflying weight 0 becomes so great that the end of the arm D is projectedbeyond the rim or flange of the disk B, (a suitable slot being made inthe rim for that purpose,) and, acting as a detent, it strikes in therevolution of the disk against the bar H, and pushesit sufiiciently backto release its shoulder e from engagement upon the guide d, allowing itto drop by its gravity, when, by reason of the connecting-chain M, theactuating-lever ot' the throttlevalve islikewise released and the steamthereby automatically turned off, while the whistle is automatically setblowing.

The throttle-valve herein described is the one patented to me March 3,1885, No. 313,365; but it is obvious that any throttle-valve may be madeself-closing in a similar manner, and I therefore do not want to confinemyself to this construction alone.

What I claim as my invention is 1. In a speed-governor, as described,the combinatiomwith the weighted lever O D, pivoted to and actuated fromthe main shaft of an engine, of an adjustable elbow-lever and a springconnecting the two levers, so as to regulate the rate of speed at whichthe weighted lever shall operate, as set forth.

2. In aspeed-governor,the combination,with the throttle-valve, asdescribed, a tripping device,and connections, of the weighted lever D,the lever F, spring E, and adjusting'screw c, as and for the purposesset forth.

3. In combination with the throttle-valve I,

arranged to be self-closing when tripped, the flying weight 0, and thecoil-spring E, havchain M, the suspended bar H, having shdulingadjusting devices, such as the lever Rand der e, the rest (1, the arm D,controlled by adjusting-screw c, all arranged substantially thecentrifugal force of the engine, and the as described. 5 disk B, allarranged substantially as described. GEORGE PARKER.

4. The combination of the upright G, liav- Witnesses: ing guides d d,the weighted bar H, having H. S. SPRAGUE, shoulder e, the'disk B, thearm D, having E. J. SOULLY.

